It does make me wonder how to stat djinn in the Dresden setting, as free will is an important part of their folklore (while a lot of them labour under bindings, that's not meant to be their nature).
Well, that's a good question... Jinn were created before humanity and are a lot like angels, even having there own Lucifer (Iblis), we western folk even get our word Satan for Iblis' new name after he got booted out of paradise. There is one snag, however, they're said to live in a mirror world to our own and are almost always invisible to humans.
Of course, you could always come up with something to make them free-willed, however, I feel that it isn't exactly necessary and you might be inviting more trouble in some cases. In the Qu'ran, they are said to have free will, but the book is written by humans, for starters. If you do take the Qu'ran as truth, are you going to make Allah the same as the White God, or another entity altogether? If they are the same, than why doesn't the Bible really mention the Jinn (speaking about public perception, don't personally know if they are inferred or referred to)? Were we lied to?! If they are different, then does that mean that angels have two bosses? Or are there different angels for both Yahweh and Allah?
Ugh... I've given myself a brain-ache...